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Crossbows - Everything about Building, Modding, and Using your Crossbow Gear

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+2
jake-owa
barsod123
6 posters

    String slips off nock center (Prod angle issue)

    barsod123
    barsod123
    barsod123
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    • Post n°1

    String slips off nock center (Prod angle issue) - Page 2 Empty String slips off nock center (Prod angle issue)

    Post by barsod123 Mon Jul 04, 2011 10:50 am

    First topic message reminder :

    Hello, I thought I saw this mentioned somewhere but I'm having a hard time finding it. I tested the crossbow and the string pops off the top nocks.Can iI fix this by wrapping the ends of the prod with string to keep it on?( kind of like the plastic end pieces the fiberglass prods have) or is this a matter of something else that needs to be fixed?
    Help in figuring this out, or directing me to somewhere else is appreciated
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    barsod123
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    • Post n°26

    String slips off nock center (Prod angle issue) - Page 2 Empty string pops off top nock

    Post by barsod123 Sun Jul 10, 2011 7:20 pm

    The string has never flown off. But anyway thanks Mac I will give those 3 things a try and hopefully I'll have a good working crossbow.
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    mac
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    • Post n°27

    String slips off nock center (Prod angle issue) - Page 2 Empty Re: String slips off nock center (Prod angle issue)

    Post by mac Mon Jul 11, 2011 4:36 pm

    Oh....I misunderstood your first post.

    My prescription still stands, though. I'm sure those things will help.

    Mac
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    Todd the archer
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    • Post n°28

    String slips off nock center (Prod angle issue) - Page 2 Empty Re: String slips off nock center (Prod angle issue)

    Post by Todd the archer Tue Jul 12, 2011 6:53 pm

    I was just looking at Darkwood armory's website and saw that they use artificial sinew for their strings. Not the best material to use and would explain why your string is stretching so much. I would highly recomend making one from B-50 for your crossbow. And I think that fastflight string is to be avoided as it does not have enough "give" when the string returns to brace after being release.

    Hope this helps, Todd
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    barsod123
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    • Post n°29

    String slips off nock center (Prod angle issue) - Page 2 Empty string pops off top nock

    Post by barsod123 Tue Jul 12, 2011 7:21 pm

    Thanks for the info Todd. I just finished filing the nocks, getting a 4" brace that stayed at 4". I havent made any strings myself so I'll try this darkwood string for a bit, since I'm learning at the moment.
    On the topic of strings is there any other material besides this B-50 I keep seeing? I ask cause I'm having a hard time finding any locally.
    Whats the best physical make-up for a string? As in no stretch,some stretch etc.
    Local guy told me when I was searching for B-50 that 100# test 100% specre fiber fishing line is stronger,doesn't deteriorate from weather, very minimal stretching(at high levels of pull) and is equivalent to kevlar. Do you think this would work for string material?
    I'll test the bow in the next three days and post if the fixes worked.
    thanks again.
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    Todd the archer
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    • Post n°30

    String slips off nock center (Prod angle issue) - Page 2 Empty Re: String slips off nock center (Prod angle issue)

    Post by Todd the archer Tue Jul 12, 2011 8:29 pm

    As for Kevlar, it was popular years ago on target recurve bows (olympic style), but they changed them after 1000 shots. They didn't last long without breaking.

    In theory a string works best with no stretch but in reality that is too harsh on the bow (particulary laminated limbs) .

    Bows built for fastflight strings usually have the tips reinforced to withstand the sudden shock.

    There is a difference betwenn stretchiness and creep. Creep is what you are experiencing where the string keeps getting longer with use. Stretchiness is when the limbs return to brace height and the string gives like a shock absorber. Some strings give more than others if at all.

    As for where to get string building materials try Three Rivers Archery they are a traditional archery supplier.

    Todd
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    Geezer
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    • Post n°31

    String slips off nock center (Prod angle issue) - Page 2 Empty Re: String slips off nock center (Prod angle issue)

    Post by Geezer Wed Jul 13, 2011 6:26 am

    When I started making crossbows, I made my strings with artificial sinew. It's a good, strong material and looks great on a medieval-style bow, but yes, it creeps far too much. You end up twisting and twisting the string to make it fit, and over-twisted strings break strands and get very stiff. Performance goes down.
    Nowadays, I use Dacron B50 from 3 rivers archery. for a continuous-loop string, I use 15 loops (30 strands) on my light, (70 lb.) bows and 25 loops (50 strands) for 150-170 lb. bows.
    Geezer
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    barsod123
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    • Post n°32

    String slips off nock center (Prod angle issue) - Page 2 Empty string pops off top nock

    Post by barsod123 Wed Jul 13, 2011 6:21 pm

    thanks geezer for the info. I just made this first crossbow for fun to shoot at targets, I'll use this artifical string for a bit, but will try another material in future.
    The brace has stayed at 4" and I fired a couple of shots. Getting the brace, and the string not to touch the belly of the recurve solved the problem. Thanks everyone for your advice.
    I believe i stumbled upon a bow press idea during this process too.
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    • Post n°33

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